In response to documents leaked by former National Security Agency contractor Edward J. Snowden, the congressional committees in charge of overseeing the government's intelligence operations have come to the defense of the surveillance and data collection programs, and the agencies that administer them. The House Permanent Select Committee on Intelligence and the Senate Select Committee on Intelligence have rejected attempts to reform the programs while advancinglegislation to bolster their legal status and providing a funding boost to the National Security Agency (NSA) to protect their secrecy.

The U.S. intelligence budget for 2013 is $52.6 billion. According to the Washington Post, "top secret spending" is divided into four main spending categories: data collection, data analysis, management, facilities and support, and data processing and exploitation. Seventy percent of the intelligence budget is used to pay private contractors. Several of the companies receiving intelligence contracts are major donors to members of the intelligence committees, including L-3 Communications, General Dynamics, Lockheed Martin, Northrop Grumman, and Honeywell International.

Data: MapLight analysis of campaign contributions from political action committees (PACs) and individuals from the top 20 intelligence services contractors working with the Department of Defense, ranked by total value of contracts received, to members of the House Permanent Select Committee on Intelligence and the Senate Select Committee on Intelligence. Data source: Federal Election Commission from January 1, 2005 - October 4, 2013. Department of Defense intelligence services contracts source: USASpending (contract totals as of September 26, 2013)

In total, members of the House Permanent Select Committee on Intelligence and the Senate Select Committee on Intelligence have received $3.7 million from top intelligence services contractors since January 1, 2005.

Members of the House Permanent Select Committee on Intelligence and the Senate Select Committee on Intelligence from Maryland -- home of NSA headquarters -- led the committees in money received from top intelligence contractors. Representative C.A. "Dutch" Ruppersberger, D-Md., is the largest recipient, having received $363,600 since January 1, 2005. Senator Barbara Mikulski, D-Md., is the second largest recipient, having received $210,150.

Republican members of House Permanent Select Committee on Intelligence and the Senate Select Committee on Intelligence have received $1.86 million since January 1, 2005, while Democrat members have received $1.82 million over the same time period.

Members of the House Permanent Select Committee on Intelligence have received $2.2 million since January 1, 2005 from top intelligence services contractors, while members of the Senate Select Committee on Intelligence have received $1.5 million.

Lockheed Martin has given $798,910 to members of the House Permanent Select Committee on Intelligence and the Senate Select Committee on Intelligence since January 1, 2005, more than any of the other top 20 intelligence service contractors. Northrop Grumman has given $753,101, the second highest amount, and Honeywell has given $714,913, the third highest amount.

About our data

Read the details about our data sources and methodology. Data refers to direct contributions to the campaign committees of elected legislators. For example, contribution totals exclude contributions to party committees such as the RNC or the DNC and exclude contributions made to individuals that did not win their election.

For U.S. Congress, contributions data provided by the Center for Responsive Politics (OpenSecrets.org) and legislative data provided by GovTrack.us.

California contributions data provided by the National Institute on Money in State Politics (FollowTheMoney.org).